<div class="modal">
    hello world
</div>


<style>
    .modal {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        z-index: 52;
        left: 0;
        bottom: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.4);
    }

    /* Modal content box */
    #product_modal .modal-content {
        background-color: #fefefe;
        padding: 20px;
        border: 1px solid #888;
        color:white !important;
        width: 80%;
        max-width: 500px;
        position: relative;
    }

    /* Close button */
    #product_modal .close {
        color: #aaa;
        position: absolute;
        top: 10px;
        right: 20px;
        font-size: 28px;
        font-weight: bold;
    }

    #product_modal .close:hover,
    #product_modal .close:focus {
        color: black;
        text-decoration: none;
        cursor: pointer;
    }
</style>